Not to be that guy that argues with a Swiss about how Swiss talk but we get broadcasts from "RTS Un" (I think that's what it's called) and the announcers most definitely say "octante". I also followed a few Swiss YouTubers a few years ago and they all said "octante" as well. Maybe it's a regional thing?

EDIT: Actually now that I dug up a bit more stuff it does seem like "huitante" is the one? Maybe I am just remembering wrong, feel free to ignore my ramblings.